package org.cn.zhaozhx.util;

import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;

public class GetFileSize {
    
    /**
     * 取得文件大小
     * 
     * @param f
     * @return
     * @throws Exception
     */
    public long getFileSizes(File f) throws Exception {
        long s = 0;
        if (f.exists()) {
            FileInputStream fis = null;
            fis = new FileInputStream(f);
            s = fis.available();
        } else {
            //f.createNewFile();
            System.out.println("文件不存在");
        }
        return s;
    }
    
    /**
     * 取得文件夹大小 递归
     * @param f
     * @return
     * @throws Exception
     */
    public long getFileSize(File f) throws Exception {
        long size = 0;
        //如果是目录
        if (f.isDirectory()){
            File flist[] = f.listFiles();
            for (int i = 0; i < flist.length; i++) {
                if (flist[i].isDirectory()) {
                    size = size + getFileSize(flist[i]);
                } else {
                    size = size + flist[i].length();
                }
            }
        }else{
            size = f.length();
        }
 
        return size;
    }
    
    /**
     * 转换文件大小
     * 
     * @param fileS
     * @return
     */
    public String FormetFileSize(long fileS) {
        DecimalFormat df = new DecimalFormat("#.00");
        String fileSizeString = "";
        if (fileS < 1024) {
            fileSizeString = df.format((double) fileS) + "B";
        } else if (fileS < 1048576) {
            fileSizeString = df.format((double) fileS / 1024) + "K";
        } else if (fileS < 1073741824) {
            fileSizeString = df.format((double) fileS / 1048576) + "M";
        } else {
            fileSizeString = df.format((double) fileS / 1073741824) + "G";
        }
        return fileSizeString;
    }
    
    /**
     * 递归求取目录文件个数
     * @param f
     * @return
     */
    public long getlist(File f) {
        long size = 0;
        File flist[] = f.listFiles();
        size = flist.length;
        for (int i = 0; i < flist.length; i++) {
            if (flist[i].isDirectory()) {
                size = size + getlist(flist[i]);
                size--;
            }
        }
        return size;
    }
    
    public static void main(String args[]) {
        GetFileSize g = new GetFileSize();
        long startTime = System.currentTimeMillis();
        try {
            long l = 0;
            String path = "H://lib";
            File ff = new File(path);
            if (ff.isDirectory()) { // 如果路径是文件夹的时候
                //System.out.println("文件个数           " + g.getlist(ff));
                //System.out.println("目录");
                //l = g.getFileSize(ff);
                //System.out.println(path + "目录的大小为：" + g.FormetFileSize(l));
                File fileList[] = ff.listFiles();
                for (File tmp : fileList) {
                    System.out.println("目录：" + tmp.getPath());
                    System.out.println("文件个数：" + g.getlist(tmp));
                    System.out.println(tmp.getPath() + "目录的大小：" + g.FormetFileSize(g.getFileSize(tmp)));
                    System.out.println("-------------------------------------------");
                }
            } else {
                System.out.println("     文件个数           1");
                System.out.println("文件");
                l = g.getFileSizes(ff);
                System.out.println(path + "文件的大小为：" + g.FormetFileSize(l));
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        long endTime = System.currentTimeMillis();
        System.out.println("总共花费时间为：" + (endTime - startTime) + "毫秒...");
    }
}
